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Uber Tester 

Make] Projects 

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build, hack, tweak, share, discover,- 

Uber Tester 

Written By: Dave Mathews 


Drill (1) 

Soldering iron (1) 
Wire cutters (1) 


• Enclosure (1) 
or gadget box 

• Lamp (1) 

• Electric buzzer (1) 

Alligator test/jumper cable set (1) 

• Wire crimps (1) 

Or shrink tubing, or electrical tape 

• Cotton balls (1) 

to keep the innards from moving around 

Battery snap connector (1) 

• Battery (1) 


When you're working on your car's 12V wiring system, it helps to have a few special tools to 
get the job done. The Uber Tester is a 4-in-1 gadget that won't remove door panel clips but 
does test for most wiring conundrums you might encounter. Plus, with its dual notification 
(buzzer and light), you'll be able to use the tool when your stereo is blasting or when you're 
contorted under the dash. 

© Make Projects 

Page 1 of 6 

Uber Tester 

This 9V-powered handheld device will test the following scenarios with just three wires: 

1 . DC polarity — positive or negative voltage 

2. Speaker polarity — "pop test" 

3. Connectivity — wire loop back 

4. Presence of voltage — fuse tester, constant or ignition switched power Installing a 12V 
accessory or stereo properly — that is, with the correct speaker polarity, switched power 
source, and constant voltage for the clock and preset memory — requires a tester such as 
this. Tracing wires in today's vehicles is next to impossible with their nearly identical colors 
and tight wire looms. This gadget will help you find that needle in a haystack. 

Step 1 — Drill holes and insert lamp. 

• Start by drilling a hole for the lamp 
in the bottom of the gadget box (not 
on the removable lid) about a 
quarter of an inch down. Then drill 
a hole just large enough to let the 
three jumper wires pass through it. 
Strip W of insulation off the lamp 
wires and insert the lamp into the 
hole you drilled for it. 

© Make Projects 

Page 2 of 6 

Uber Tester 

Step 2 — Insert wires. 

• Cut one alligator clip off the end of 
each of the red, green, and black 
wires and poke the wires into the 
gadget box, leaving the alligator 
clips outside of the box. Tie the 
three wires into a knot to prevent 
them from pulling through the hole, 
leaving about 2" of wire to work 
with inside the box. 

• Strip the wires back W to prepare 
for the connections. 

© Make Projects 

Page 3 of 6 

Uber Tester 

Step 3 — Connect wires. 

• Connect the black wire from the 9V 
harness to the black alligator clip 

• Connect the red wire from the 9V 
harness to the red alligator clip 
wire, the red buzzer wire, and to 
one of the lamp wires. 

• Connect the black wire from the 
buzzer to the green alligator clip 
wire and to the second wire on the 

• Check wiring. 

• Note that coming from the 
alligator clip jumpers, the 
red wire makes three connections, 
the green wire makes two, and the 
black one only connects to one. 
That's it! 


© Make Projects 

Page 4 of 6 

Uber Tester 

Step 4 — Test your uber tool- 

• Connect the 9V battery to the 
connector and touch the black and 
green alligator clips together — you 
should hear a tone and the light 
should illuminate. Connect the red 
wire to a positive 12V (or lower) 
source and the black to ground, 
and you should hear a tone and see 
the light illuminate. If so, your 
wiring is properly connected. 

Step 5 — Reinforce the alligator clips. 

• Now would be a good time to put 
some extra solder on the jumper 
wires inside the alligator clips. 
Usually they are merely crimped 
on, which will not provide a strong 
enough connection to allow you to 
let your tester dangle. 

• Just pull back the protective 
covers on the jumpers, clip the 
jumpers to a piece of cardboard to 
keep them from moving around, 
and load up the solder under where 
the wires are crimped. 

© Make Projects 

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Uber Tester 

Step 6 — Finishing up. 

• Now it's time to stuff the buzzer, 
battery, and wires into the gadget 
box. Put the cotton balls in the 
leftover space to keep the tester 
from sounding like a baby's rattle. 

• Note: 12V UBER TESTER 
WIRE GUIDE Red/Black 9V 
output and speaker polarity pop 
test Black/Green Continuity test 
Green/Red Voltage presence — 
constant or switched Memorize this 
guide, or copy it and paste it onto 
your gadget box. 

• To prevent your battery from dying, 
keep the red wire from shorting on 
the black or green wires by pulling 
the insulation hood over the metal. 
You should see years of service 
from your battery since it is rarely 

This project first appeared in MAKE Volume 03 , page 56. 

This document was last generated on 201 2-1 1 -02 1 1 :54:53 PM. 

© Make Projects 

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